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From: "John D'Errico" <woodchips@rochester.rr.com>
Newsgroups: comp.soft-sys.matlab
Subject: Re: machine vision-Color Matching
Date: Thu, 28 Feb 2008 12:18:01 +0000 (UTC)
Organization: John D'Errico (1-3LEW5R)
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"Vihang Patil" <vihang_patil@yahoo.com> wrote in message 
<fq632c$i7s$1@fred.mathworks.com>...
> Thanks John and ImageAnalyst, will definately work on your 
> suggestions.
> Its quite true what John said, about human perception of 
> color. I too had a similar experience once, when me and my 
> brother were lazing on the bed and I told him the celing 
> is looking pale yellow. While he was pretty sure that it 
> was pure white. We had a good long debate, where finally I 
> won "Since I am the elder one". That normally happens, I 
> guess the elders bullies the younger and make them accept 
> that they were wrong.
> But Jokes apart I think I will need to do extensive study 
> on color recognition.
> Thanks and Regards
> Vihang

About 20 years ago I did some studies on color
blindness. This brought me in contact with a
color blind opthamologist, as well as a few other
people who were color blind.

The doctor had an interesting story to tell - he
never knew he was color blind until med school,
where he had a class where they showed the
Ishihara plates and he saw the wrong things!
The point is that many people who have this
characteristic don't actually know they have it,
or it takes them years to realize. A person might
also have various degrees of color anomaly.

http://mysite.du.edu/~jcalvert/optics/colvisn.htm

Finally, I was also reading recently that some
women even have 4 distinct types of cones in
their eyes. They see color in 4 dimensions. Do
a Google search for the word "quadchromatic"
or "tetrachromatic women".

John